The lsof is a command line tool that displays information about the files opened by processes. A file can be regular file, directory, block device, network socket, named pipe, etc...

The img2pdf is a command line tool that allows to convert images (JPEG, PNG, etc.) to PDF file. This tool performs a lossless conversion. The images included in the PDF...

The uptime is a command line tool that allows to determine how long the system has been running. By default, uptime command is already installed on Raspberry Pi OS. We...

Working with dates sometimes we need to perform various arithmetic operations. Learn how to calculate number of weeks between two dates using different programming languages. A table includes a links...

The aspell is a command line tool that allows to check spelling errors for a given file or individual words provided from standard input. This tool displays misspellings and allows...

GitHub provides API that allows to manage repositories and get details of them, manage pull requests and issues, get a list of stargazers and watchers, etc. This tutorial provides example...

Slack is a messaging service that allows to communicate with team members. Slack allows creating channels where a team members can send messages and share files. Incoming Webhooks is one...

The lshw is a command line tool that displays detailed information about hardware components on a system. This tool shows details about CPU, RAM, network interfaces, USB controllers, etc. This...

Saidar is a command line tool which provides information about system resources usage that updated at regular intervals. This tool allows to monitor CPU usage, memory usage, disk usage, network...

A MAC (Media Access Control) address is a unique number that assigned to a network adapter by the manufacturer to uniquely identify it. A MAC address is commonly represented as...